Over seven decades, Barzun wrote and edited more than forty books touching on an unusually broad range of subjects, including science and medicine, psychiatry from Robert Burton through William James to modern methods, and art, and classical music; he was one of the all-time authorities on Hector Berlioz.

At 84 years of age, he began writing his swan song, to which he devoted the better part of the 1990s. The resulting book of more than 800 pages, From Dawn to Decadence: 500 Years of Western Cultural Life, 1500 to the Present, reveals a vast erudition and brilliance undimmed by advanced age. Historians, literary critics, and popular reviewers all lauded From Dawn to Decadence as a sweeping and powerful survey of modern Western history?